I had a similar issue with mine at 1600 miles, they replaced the throttle body, no more problems and I now have 33,500 on it. As far as a copy of the repairs, my dealer gives me a copy even if it is under warranty. It is a regular invoice and it even shows the cost, just no charge to me.

 

Bingo! I was thinking of that too. The symptons that I experience are identical to what an old carbeurated motor would do if the accelerator pump was defective. Fuel injection doesn't have an accelerator pump, but it must still dump in extra fuel when you mash the gas. How does it know? By the throttle position sensor, which if defective, might not register the change quickly and cause the problem. On the GT, this would cause the symptons I am having, because the throttle valve is still mechanical. But on the newer F150, it would only cause throttle lag, I would imagine.

 

I know your frustration! I had a problem similar to yours about 3 months ago. The truck would fall on its face if i needed to speed up quickly. The first couple thousand miles were without this problem, and just started doing this. I took it to the first dealership 3 TIMES without a fix, then to a 2nd dealership once with the same result. I ended up driving over an hour north to a third dealership only after talking to the service manager for about 30 minutes about the problem. They found 3 bad injectors and a very unhealthy fuel filter (two months later), and this thing drives better now than it ever did. The tech spoke to me after the fix about the other dealers not finding the problem. He decided that I must have bought really bad gas somewhere recently to cause this much fouling. I ended up getting a call from the first dealer offering free oil changes for life...on any Ford vehicle I buy. The take-home message is to try another Ford service department. Good Luck, my friend.

 

Guys could you imagine if an injector sticks open after the warranty is up?? I couldnt imagine replacing an entire short block along with exhaust components damaged! What brand of fuel injectors is Ford using exactly, Im afraid to find out. If they use such brands as Hankook, then theres no telling what other cheap brands their using.


I guess I'll add fuel injectors to my normal routine maintenance replacement list.

 

I've replaced lots of PCMs in early-mid '90s Exploders and Rangers for weird driveability problems.

Your Mustang might have an ignition coil breaking down under load. For whatever reason, the injector concern seems to affect mostly '05-'06 5.4 3Vs. In an effort to save a buck from the '04s, Ford changed vendors for their injectors and obviously that was a very bad idea.

 

Man, this dealership really sounds like they may not know what the issue is man, maybe theyve got some brand new techs and thats why theyre bein so polite, bcuz there is no excuse for them to not be able to isolate the faulty part and also give you a print out of what the part was and the work performed man. This is what it sounds like to me man. Just please dont jump to the conclusion that your truck was a bad decision. These trucks are awesome, Ive got 23,000 miles on mine, have had only 2 issues, which I mean if you drive your vehicle everyday little things are bound to go bad, but the dealership, thankfully, had some good experienced techs and were able to find the faulty part, replace it rather quickly, never cost me a dime, and always got a printout of the work performed. Bottom line, great trucks, tell yer dealership ta get their sh*t tagether n fix yer baby!!!

 

I had to replace a coil pack recently on a LTC with very similar symptons, (minus the backfiring). Probably best described more like a stumble at part throttle, although it didn't do it at full throttle. This was a Town Car with 90K+ miles though.

 

It happened to my sister on her previous generation F150. The engine hydrolocked and destroyed itself when she tried to start it. Luckily, she had bought the extended warranty and the repairs were on the dealer.

Grim

 

Thanks Quintin!

 

Well Here is the latest.... The dealership keep my truck for three weeks. I was never called about my truck until, I called to check on the status. (This dealership is one of the biggest in North Carolina. They have been around over 50 years. They have an excellent rating from the manufacturer... I Called Dearborn and inquired about them) The final outcome is this, All of my problems are due to the TRUE dual exhaust I have on my truck.[Installed with around 150 miles on vehicle] The dealership removed my Drop-In K&N filter and my dual exhaust... They installed factory air filter and factory exhaust. I was called on Friday and was told "It's Fixed" but, They want me to come and drive it, then they will remove the factory exhaust installed during trouble shooting and I MUST have factory exhaust and factory air filter on this vehicle for any additional "Warranty Work" relating to this Engine Missing/Sputtering/Back firing problem...
Okay... Now get this!! I went over Saturday to test drive the truck. I pulled out of dealership pressed on the accelerator and "cough, sputter" jerking was noticed... The same symptoms as before. I drove the truck 71 miles and put it through "Normal" driving scenarios and when you applied normal to WOT eight out of ten times it will "Miss/Sputter and sometimes backfire or make a popping sound". I returned to the dealership totally pissed-off. I was transferring some items to my wifes car when this guy{6foot plus, shaved head, small gotee weighing approx. 250lbs and wearing mirrored shades} came up to me and said "Well, what do you think? Runs sweet right?" I looked up and just lost it!! I called him everything but white... I am right now waiting for the dealership to open. This technicaian(the big guy) explained that these new engines CAN NOT run True Duals with a K&N drop-in filter... He said "No Back Pressure" and thats causing the problem... I tried to tell him the truck is still hosed-up but he did not want to hear that. As a matter of fact he "Swore" that the truck runs perfect. I guess I'll end up trading this Brand New truck for another one, BTW is has 3945 mile on it.

*** ANYONE WITH INFORMATION ABOUT WHAT I CAN DO PLEASE RESPOND. I AM PAST THE POINT OF FURSTRATION.... I NEED SOME HELP *****

 

True dual exhaust causing all your problems? Now I've heard everything.

Sticking injectors and/or burnt up catalytic converters are a well known and documented problem on '05-'06 5.4 3Vs. You desperately need to find another dealer - or, give me a little time, I'll try to dig up some literature for you on the problem.

Dealers like that **** me off, 'cause they make all dealers and their techs look like idiots. I'm willing to bet that you've got a plugged up converter, caused by an intermittently sticking injector. Left unchecked, this will eventually cause catastrophic damage to the engine.

 

Hi,
I've got a 99 lightning with 70,000mi. It just started doing that today! It has a boost gauge, and it only happens when the boost is over 2-3psi. It startes to bog down, and miss, and if I push the boost up to 5-6 it will backfire. This happens at 1500 rpm or 4500 rpm. It's not a function of rpm, just boost. I'm thinking it's a MAP sensor, but the boost gauge works fine. (It even spikes when it backfires, I don't want to see that again!) Maybe this could get the techs on the right track. If you find out anthing I'd like to know.

 

My truck occasionaly does the same thing. Dealer has yet to find an issue. I do not post often, but my truck is a piece of junk. Last ford I will buy unless they get their quality control better.

 

Just a follow up. I finally got around to replacing four of the eight coils on plug, did the driver's side.

Just an FYI, I ordered from AutoPartsWarehouse and they sent the wrong parts and were a real PITA to deal with, plus the parts were real cheap, get what you pay for. After a lengthy return I ordered from Ford-Parts.com, got the right parts (yes, you have to give them your VIN) and they were FoMoCo.

Anyway, the coils on plug were the problem, and the vehicle now runs much better. This also fixed the infamous 1 - 2 shift lag that the GTs are known for. Thanks Quintin!